Invasive climbing weed, can anyone identify

I have a friend who has an invasive climbing weed smothering shrubs in the garden. No idea at the moment if it flowers, loses leaf, changes colour etc. It twines on long stems but the leaf doesn't appear until it reaches light at the top of the shrubs. It then grows all around the tops of the shrubs. Will attempt to attach a photo

It looks like hops to me - it should feel rough, slightly bristly. There are male and female hop plants, only the females will have the flowers used for brewing, but apparently home brewers are quite keen on getting 'green hop flowers' rather than dried ones so you could ask around if anyone wants them when they bloom. They can look really attractive in the autumn (there is a golden form too) and you can gather the vines with blooms on to decorate your home etc. If you friend likes it tell him/her just to cut it down in the autumn, it'll regrow again, and if it's getting a bit rampant just thin out the growing stems and try to train it into a tree or trellis/arbour/boundary hedge etc. Or if they really hate it they could dig it out and glyphosate any regrowth.

We don't know what the flowers look like as he's ripped it all out before it got chance to flower. Spoken to him today and done some more research on white bryony and he says the description of the root is exactly what it's like so we're pretty sure that's what it is now. Thanks to everyone for their suggestions, I had no idea at all what it was!